(CNN) -- Tiger Woods is saving his best in a disappointing year for last as he leads the Chevron World Challenge by four strokes at halfway in California..
Woods carded a flawless six-under par 66 for 13-under 131 to increase his lead to four strokes over U.S. Open champion Graeme McDowell.
The world number two has not won since the 2009 Australian Masters, but is well-placed to end that run in the 18-man invitational tournament, which is not an official PGA Tour event, but does carry world ranking points.
Woods, who is the tournament host and donates profits to his foundation, is certainly at home on the Sherwood Country Club layout.
"It feels good," Woods told reporters at the end of his second rond. CNN
